IMO Mathematics Olympiad Class 10: Questions 512  516 of 908
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Question number: 512
Question
Five years ago, a father was four times as old as his son. 8 years later, father’s age will be exceeding his son’s age by 12 years. The ratio of the present ages of father and son is ________
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 513
Question
5 bells commence tolling together and toll at intervals of 3, 6, 9, 12 and 15 seconds respectively. In 12 minutes, how many times do they toll together?
Choices
Choice (4)  Response  

a.  5 

b.  6 

c.  7 

d.  4 

Question number: 514
Question
The present ages of A, B and C are in proportions . Eight years ago, the sum of their ages was 76. What are their present ages (in years)?
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 515
Question
Kamla got married 6 years ago. Today her age is times her age at the time of marriage. Her son’s age is times her age. Her son’s age is ________
Choices
Choice (4)  Response  

a.  5 years 

b.  3 years 

c.  4 years 

d.  2 years 

Question number: 516
Question
2 men and 7 boys can do a piece of work in 14 day, 3 men and 8 boys can do the same in 11 days. 8 men and 6 boys can do 3 times the amount of this work in ________
Choices
Choice (4)  Response  

a.  18 days 

b.  36 days 

c.  24 days 

d.  21 days 
